PATS - anti-theft issues

[getdealtwith]

There probably is a thread somewhere covering this question for 2nd gen Expys already. If so, please point me in the right direction as I haven't been able to find it yet.

If not, here's my question: ever since installing a new battery and replacing the corroded terminal connector, I've had the PATS on my car go off. It happens every time I unhook the battery and occasionally after unlocking the doors. I'm only using the OEM key. After unhooking the battery, I have to go through the procedure of putting the key into the door lock, turning and leaving it for 50+ seconds to shut up the PATS. In case of the random set-offs, putting it into the ignition has sufficed in a couple of cases.

What is the issue here and how do I fix it? Affix the OEM key near the ignition lock and use a spare or replace a module?

This isn't a huge issue for me but I'm trying to avoid my wife running into this on trips with our baby. Thx

 

[getdealtwith]

Thought I'd post an update here after investigating further in case this helps someone. I have a U1262 code that I can't get cleared indicating wiring, IC or PCM. There are no visible issues with the IC. I haven't tested any pins on the PCM yet but already have an idea of the very likely possible culprit. (Corroded battery terminal that broke and caused the 4-5 seconds of erratic "on/off" connection loss before I got it off completely)

I haven't tested any pins yet but instead reset the PCM. The PATS hasn't come on again and otherwise worked fine (programmed 2 keys, no errors in ForScan). I'll keep monitoring.